DETAILED ACCOUNT OF SPECIFIC DISEASES OF PLANTS 501 



Fig. 178. — Photograph showing svtccessive stages in the germination of asco- 

 spores and pycnospores of the chestnut blight fungus {Endolhia parasitica). Left, 

 ascospore series from 8 to 22 hours at hourly intervals; right, pycnospore series from 

 8 to 22 hours, taken every two hours. {After photo by Wm, Currie, Bull. 5, Penna. 

 Chestnut Tree Blight Com., 1913.) 



